Electric bed

Abstract

An electric bed includes a base, a back supporting unit pivotally connected with the base, a first actuator to drive the back supporting unit to upwardly and downwardly swing relative to the base, a head supporting unit pivotally connected with the back supporting unit, and a second actuator to drive the head supporting unit to swing between an initial position and a head-up position relative to the back supporting unit. When the head supporting unit stays at the initial position, a head supporting surface of the head supporting unit is flush with a back supporting surface of the back supporting unit. The head-up position is lower than the initial position.

What is claimed is: 
     
       1. An electric bed comprising:
 a base; 
 a back supporting unit having an end pivotally connected with the base, and a top side provided with a back supporting surface; 
 a first actuator having two ends respectively and pivotally connected with the base and the back supporting unit in a way that the back supporting unit is driven by the first actuator to upwardly and downwardly swing relative to the base; 
 a head supporting unit having an end pivotally connected with the back supporting unit, and a top side provided with a head supporting surface; and 
 a second actuator having two ends respectively and pivotally connected with the back supporting unit and the head supporting unit in a way that the head supporting unit is driven by the second actuator to swing between an initial position and a head-up position relative to the back supporting unit; 
 wherein when the head supporting unit stays at the initial position, the head supporting surface is flush with the back supporting surface; 
 wherein the head supporting unit is driven by the second actuator to swing downwardly from the initial position to the head-up position where the head supporting unit is lower than the head supporting unit at the initial position. 
 
     
     
       2. The electric bed as claimed in  claim 1 , wherein the head supporting unit is driven by the second actuator to swing to a head-down position relative to the back supporting unit; the head-down position is higher than the initial position. 
     
     
       3. The electric bed as claimed in  claim 1 , wherein when the head supporting unit stays at the initial position, one of the two ends of the second actuator, which is pivotally connected with the head supporting unit, is lower than the other of the two ends of the second actuator, which is pivotally connected with the back supporting unit. 
     
     
       4. The electric bed as claimed in  claim 1 , wherein the head supporting unit comprises a head supporting frame, a head supporting plate disposed on the head supporting frame, and a pivot mount downwardly extending from the head supporting frame; one of the two ends of the second actuator is pivotally connected with the pivot mount. 
     
     
       5. The electric bed as claimed in  claim 4 , wherein when the head supporting unit stays at the initial position, a bottom of the pivot mount is not lower than a bottom of the base. 
     
     
       6. The electric bed as claimed in  claim 1 , wherein when the head supporting unit stays at the head-up position, the head supporting surface is defined with the back supporting surface an included angle ranging from 10 degrees to 30 degrees. 
     
     
       7. The electric bed as claimed in  claim 1 , wherein the back supporting unit comprises a back supporting frame and a back supporting plate disposed on the back supporting frame; the base comprises a buttock supporting unit comprising a buttock supporting frame, a buttock supporting plate disposed on the buttock supporting frame, and a pivot mount downwardly extending from the buttock supporting frame; one of the two ends of the first actuator is pivotally connected with the pivot mount, and the other of the two ends of the first actuator is pivotally connected with the back supporting frame. 
     
     
       8. The electric bed as claimed in  claim 7 , wherein a bottom of the pivot mount of the buttock supporting unit is not lower than a bottom of the base. 
     
     
       9. The electric bed as claimed in  claim 1 , wherein the head supporting unit has a length ranging from 9 inches to 16 inches. 
     
     
       10. The electric bed as claimed in  claim 1 , comprising a mattress disposed on the back supporting unit and the head supporting unit, and a tying strip sleeving and tying the head supporting unit and the mattress together in a way that the mattress is swingable along with the head supporting unit and moveable relative to the head supporting unit in a back-and-forth direction.